Locking

Locking

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By default, when you drag points in a Geometry Expressions model, it adjusts the variable values to accommodate the drag as best it can. For example, in the model of a four-bar linkage below, dragging point B changes lengths a and b and angle θ:

 

However, you may wish the drag to act as if lines AB, BC, and CD were rigid, and only angle θ adjustable. To arrange this, lock all the variables except θ.

Locking a variable applies only to its behavior when you drag the drawing. You can still assign it a value by entering it in the input field.